Final answer:
Attending classes, earning certifications, and developing written plans with goals are examples of professional development, which refers to enhancing skills and knowledge for career progress.
Step-by-step explanation:
Attending classes, earning certifications, and developing written plans with concrete goals are examples of professional development. This concept refers to activities that enhance one's skills and knowledge for career advancement. These activities might include informational interviews, job shadowing, and volunteering, as well as joining professional associations and gaining work experience.
In addition, exploring professional development options and learning about certification processes in a specific field can significantly enhance one's expertise and employability. Continuous learning and skill building are highly valued by employers and can lead to career progression. Therefore, the appropriate answer to the student's question is c) Professional development.